Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...

[karo-tx-linux.git] / drivers / mtd / mtd_blkdevs.c

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 63790e975d204087feee6675a1deb1c68f3c6b1f..f9329794f3b554936f13fda170ddb0d16eb9bc57 100644 (file)
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -29,7 +29,6 @@
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/spinlock.h>
-#include <linux/smp_lock.h>
 #include <linux/hdreg.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
@@ -38,6 +37,7 @@
 
 #include "mtdcore.h"
 
+static DEFINE_MUTEX(mtd_blkdevs_mutex);
 static LIST_HEAD(blktrans_majors);
 static DEFINE_MUTEX(blktrans_ref_mutex);
 
@@ -185,6 +185,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
        if (!dev)
                return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
+       mutex_lock(&mtd_blkdevs_mutex);
        mutex_lock(&dev->lock);
 
        if (dev->open++)
@@ -201,6 +202,7 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
 unlock:
        mutex_unlock(&dev->lock);
        blktrans_dev_put(dev);
+       mutex_unlock(&mtd_blkdevs_mutex);
        return ret;
 }
 
@@ -212,6 +214,7 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
        if (!dev)
                return ret;
 
+       mutex_lock(&mtd_blkdevs_mutex);
        mutex_lock(&dev->lock);
 
        if (--dev->open)
@@ -227,6 +230,7 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
 unlock:
        mutex_unlock(&dev->lock);
        blktrans_dev_put(dev);
+       mutex_unlock(&mtd_blkdevs_mutex);
        return ret;
 }
 
@@ -259,6 +263,7 @@ static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
        if (!dev)
                return ret;
 
+       mutex_lock(&mtd_blkdevs_mutex);
        mutex_lock(&dev->lock);
 
        if (!dev->mtd)
@@ -273,6 +278,7 @@ static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
        }
 unlock:
        mutex_unlock(&dev->lock);
+       mutex_unlock(&mtd_blkdevs_mutex);
        blktrans_dev_put(dev);
        return ret;
 }